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Rezolvati ecuatia :
x + [tex] \frac{4}{5} [/tex] din x =90


Răspuns :

aducem la acelasi numitor, amplificam x si 90 cu 5

[tex] \frac{5x}{5}+ \frac{4x}{5}= \frac{450}{5} [/tex]

5x+4x=450
9x=450
x=450:9
x=50
5/5*x+4/5*x =90
9/5*x=90
x= 90*5/9
x=50